Form Work. In general the formwork should be of marine ply xxxxx plates. Only for slab bottom the formwork of M.S. plates can be allowed on merit basis based on the condition of M.S. plates if they are suitable designed for the purpose. It will not be binding on the part of the Engineer In charge .to allows for M.
Form Work. Formwork shall conform to the shape, lines and dimensions of concrete and RCC structures as shown in the drawings and shall be well within the permissible tolerance. Formwork for concrete shall be of plywood, steel, good seasoned timber or other approved materials, properly designed easy for removal and cleaning. They shall be of sufficient strength and rigidity to maintain their position and shape under loads incidental to placing concrete. The number of props, their sizes and dispositions shall be such as to able safely carry the full dead load area constructional loads. The arrangement and alignment of formwork shall be got approved by the Engineer- in-charge prior to concreting. However, this shall not relieve the contractor from his responsibility for proper work and safety. Formwork shall be sufficiently tight to prevent loss of cement slurry from the concrete. All joints and holes in the formwork shall be caulked with putty jute cloth or other approved materials to the satisfaction of the Engineer-in-charge. The stripping time for the shuttering and the formwork shall in general conform to the provisions in the relevant clauses of IS 456. Unless otherwise specified rates for reinforced cement concrete shall include cost of centering, shuttering charges also.
Form Work. Formworks for concrete shall be constructed from materials of sufficient strength and supported to ensure that there is no deflection when concrete in placed. The formwork shall conform to the shapes, lines and dimensions of structures shown on the drawings. Where the concrete finished surface is exposed, the formwork shall be of good quality and free of gaps. Formwork shall not be removed until the concrete has obtained sufficient strength. Normally, formwork can be removed from walls after 2 days and from beneath slabs after 2 weeks. The minimum periods between concreting and the removal of forms shall be as follows: Sides of beams, walls, columns and piles 24 hours Soffits of secondary slabs (props left in) 4 days Soffits of main slabs (props left in) 8 days Soffits of beams (props left in) 8 days Removal of props - secondary slabs 10 days Removal of props - beams and main slabs 21 days Arch centres, wedges eased 8 days Arch centres, struck 21 days The times in the above table are given as a guide and are based on average weather conditions and the use of Ordinary Cement. They may be changed if other types of cement are used, subject to the Engineer's agreement. Formwork shall be constructed so that it can be removed without undue shock or vibration and so that side shutters of members can be removed without disturbing the soffit shutters; if the contractor wishes to leave some of the props in place when the soffit shutters are removed, these props shall not be disturbed during the striking. The detailed arrangements of the props shall be submitted in advance to the Engineer. In the case of heavy loading, folding wedges shall be provided. For pre-stressed units the side shutters shall be eased as early as possible and the soffit shutters shall permit movement of the units when the pre-stress is applied. All formwork must be removed without damage to the concrete.
Form Work. EPC - Exhibit B ------------------------ TENASKA GEORGIA GENERATION PROJECT Page 35 of 132 --------------------------------------------------- ------------------------ --------------------------------------------------- ------------------------ Forms shall be used wherever required to confine concrete and shape it to the required dimensions. Forms shall be of sufficient strength to withstand the pressure resulting from the placement and vibration of concrete and of sufficient rigidity to maintain required dimensions. Forms shall be constructed of either plywood or metal. The forms shall be tight to prevent leakage, straight, and without dents. Before placing either reinforcing steel or concrete, clean all form surfaces of mortar, grout and foreign material and cover the surfaces of forms with a coating (form release agents) that will prevent the absorption of moisture and prevent bonding with concrete.
Form Work. Form work shall conform to the slope lines, curvature and dimensions of concrete and RCC structure as shown in the relevant drawings. Form work for concrete shall be plywood, steel plates, seasoned timber or other approved materials as per directions of the Engineer. It shall besufficiently tightened to prevent loss of cement slurry and all holes and joints shall be chaulked with putty. For casting R.C.C. slab polythene sheet may have to be used to prevent leakage as advised by the Engineer Incharge for which no extra payment will be made to the Contractor.
Form Work. (a) Form work shall comply with requirements of clause 4.11.6 and clause 7.15 of MES Schedule.
(b) Props shall be of steel of adequate length and strength. Formwork using steel props depending upon the provisions in the contract shall be designed by the Contractor’s site engineer and approved by the GE keeping in view the following guidelines:
(i) Deadweight of concrete and steel
(ii) Load carrying capacity of the props
(iii) Sequence and schedule of concrete pours
(iv) Number of vibrators to be put in service
(v) Any other criteria as considered necessary by the GE
(c) Form work shall be of steel of adequate strength. However deformed steel sheet shall not be used or permitted for use as formwork.
(d) Props should be straight and placed in true vertical position. Vertical props should be provided with braces in both directions. Number of vertical intervals at which braces are to be provided, shall be as decided and approved by the GE, depending upon the height of the structure and horizontal loading. Bracings and supports shall be of steel and shall be adequately tied / welded to form firm joints.
(e) Moving loads in the form of workers on the top of the form work should be minimized by pumping the concrete and restricting the number of workers. The impact and horizontal loads due to movement of workers should be minimized by keeping them stationery and just moving concrete containers from one person to other up to the place of pouring. It should be ensured that sub base of the floor is completed and cured after consolidating the earth underneath so that it gives firm base to the props. Vertical props should be provided with braces in both directions. Number of vertical intervals at which braces are to be provided, shall depend upon height of the structure and horizontal loading.
(f) Safety of the workmen and structure shall be ensured by thorough checks that scaffolds are safe, the spacing of verticals, horizontals and braces are carefully designed, making safe access arrangement, preferring steel scaffolds to wooden scaffolds, no bamboo scaffolds shall be used, taking adequate measures against fire, use of safety helmets and safety belts, providing sufficient illumination of work area if work is in progress at night, special attention of female workforce for loose garments, etc. The decision of the GE in this regard shall be final and binding.
(g) In case of any deviation involving form work the pricing shall done at the rates of timber formwork for fai...
Form Work. 5.7.1 Form work shall be all as described in clause 4.11.6 and 7.15 of MES Schedule Part I.
Form Work. 7.0.1. Form work shall be designated and constructed to shapes, lines and dimensions as ordered by Engineer – In – Charge. All forms shall be sufficiently water tight to prevent leakage of mortar. Form shall be so constructed as to removable in sections. It shall be provided for the sufficient stripping time as mentioned in M.E.S SSR Part - I (2009) Clause No. 4.11.6.3. In case of bad weather these periods may be increased on the direction of Engineer – in – Charge.
7.0.2. Materials for formwork shall be of timber. Alternatively the contractor may provide formwork of plywood, timber with steel sheet lining or steel plate stiffened by steel angles without any price adjustment.
7.0.3. The formwork shall be rigid and so constructed as to retain the shape and dimensions of the member being casted. It shall have sufficient strength and rigidity to withstand the load of concrete, vibrations, movement of staffs, materials, and plants and other incidental load without excessive deflection beyond permissible limits.
Form Work. All props, planks, plates, braces, ties, bolts, wedges etc. shall be provided and all form work shall be sufficiently strong and sound for the purposes. Formwork shall be thoroughly cleaned with wire brush etc. after use and oiled (with fresh and clear oil) or greased each time before use. Wooden formwork shall be replaced from time to time with new timber as necessary and steel plates shall be got repaired from time to time. For all exposed work, all the forms of fresh and raw steel shall be used as per pattern given by Consulting Engineers/Architects for the various members of the structure. For wooden formwork, type of the timber as specified in the Bills of Quantities shall be provided. All the formwork provided by the Contractor shall be approved by Engineer-in-Charge before use and the Contractor shall be allowed to use approved formwork only.
Form Work. Contractor shall furnish on the site of work sufficient number of centering, forms, moulds or templates for its expeditious prosecution, the forms shall be made in such a way and such material as will ensure a very smooth surface on the finished concrete. Forms and centering shall be left in place until the concrete has set sufficiently to permit the removal without danger to the structure.
